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Non-autoclave-curing dry-mix active powder concrete and preparation method thereof

A technology for reactive powder and concrete, applied in the field of building materials, can solve the problems that reactive powder concrete needs steam curing, cannot be applied to on-site pouring, and high production cost, and achieves the effects of expanding application, reducing overall cost and simple preparation process.

Inactive Publication Date: 2015-03-04
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the problems that commonly used reactive powder concrete requires steam curing, cannot be applied to on-site pouring, and has high production costs, the invention creatively solves the problem of steam curing by improving the performance of the material itself, and proposes the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw materials of the dry material are weighed according to the following proportions

[0024] Ordinary cement: 0.6

[0025] Modified silica fume: 0.2

[0026] Finely ground slag powder: 0.2

[0027] Tailing sand: 0.8

[0028] Powdered polycarboxylate superplasticizer: 0.07

[0029] Steel fiber (high-strength circular cross-section fiber): 0.1

[0030] First pour the dry material into the mixer, then weigh 15% water of the mass of the cementitious material, add the water into the mixer, and stir for not less than 3 minutes until the mixture is evenly stirred. Put the stirred active powder concrete into the test mold, and vibrate on the vibrating table for 2 minutes; the formed test piece is left at room temperature for one day, and then the formwork is removed, and the test piece after the formwork removal is put into the concrete standard curing room (Temperature 20 ℃, humidity 95%) carry out curing, curing to the specified age for testing.

[0031] The proper...

Embodiment 2

[0033] The raw materials of the dry material are weighed according to the following proportions

[0034] Ultrafine cement: 0.6

[0035] Ordinary cement: 0.2

[0036] Finely ground slag powder: 0.2

[0037] Tailing sand: 0.6

[0038] Basalt coarse aggregate: 0.6

[0039] Powdered naphthalene-based water reducer: 0.15

[0040] Steel fiber (high-strength circular cross-section fiber): 0.1

[0041] First pour the dry material into the mixer, then weigh 15% water of the mass of the cementitious material, add the water into the mixer, and stir for not less than 3 minutes until the mixture is evenly stirred. Put the stirred active powder concrete into the test mold, and vibrate on the vibrating table for 2 minutes; the formed test piece is left at room temperature for one day, and then the formwork is removed, and the test piece after the formwork removal is put into the concrete standard curing room (Temperature 20 ℃, humidity 95%) carry out curing, curing to the specified age...

Embodiment 3

[0044] The raw materials of the dry material are weighed according to the following proportions

[0045] Ordinary cement: 0.6

[0046] Rapid hardening cement: 0.2

[0047] Finely ground slag powder: 0.2

[0048] River Sand: 1.0

[0049] Basalt coarse aggregate: 0.3

[0050] Powdered sodium silicate: 0.13

[0051] Steel fiber (high-strength circular cross-section fiber): 0.1

[0052]First pour the dry material into the blender, then weigh the water with 13% mass of the cementitious material, add the water into the blender, and stir for no less than 3 minutes until the mixture is evenly stirred. Put the stirred active powder concrete into the test mold, and vibrate on the vibrating table for 2 minutes; the formed test piece is left at room temperature for one day, and then the formwork is removed, and the test piece after the formwork removal is put into the concrete standard curing room (Temperature 20 ℃, humidity 95%) carry out curing, curing to the specified age for tes...

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Abstract

The invention relates to a non-autoclave-curing dry-mix active powder concrete and a preparation method thereof. The active powder concrete is prepared by proportionally mixing a dry material and water. The dry material is prepared by homogenizing the following components in parts by mass: 1 part of cementing material, 0.8-1.3 parts of powder additive, 0.01-0.2 part of aggregate and 0.01-0.25 part of steel fiber. The proportion of the dry material to the water is 1:(0.1-0.3). Under normal-temperature curing conditions, the compression strength of the active powder concrete material can reach 130 MPa above, the folding strength can reach 19 MPa above, and the elastic modulus can reach 48 GPa above. Field casting, controllable quality and environmental protection of the powder concrete are successfully implemented on the basis of the concept on dry-mix material preparation; and the prepared non-autoclave-curing active powder concrete can be used in the fields of high-speed railway cable trough cover plates, sidewalk plates, bridge floor, municipal well covers, repair and reinforcement, and the like.

Description

Technical field: [0001] The invention belongs to the field of building materials, and in particular relates to a low-cost, steam-free, green and environment-friendly active powder concrete material and a preparation method thereof. Background technique: [0002] Active powder concrete is a new type of ultra-high-strength cement-based material first researched and developed by the research team headed by Pierre Richard from the French BOUYGUES Science Department in the early 1990s. This material is due to the activity and fineness of the powder components. The increase is named active powder concrete. Due to its excellent mechanical properties, reactive powder concrete can be processed into sidewalk step boards and cable trough covers with small thickness, so as to reduce the dead load of the second phase of the bridge deck, improve the durability of the bridge deck facilities, and reduce the labor load during installation. The sidewalk treads and cable trough covers based o...

Claims

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Application Information

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IPC IPC(8): C04B28/08
Inventor 李化建易忠来谭盐宾谢永江李林香
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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